Importance

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Abstract

The invention relates to devices for sealing an annular gap between two sealing surfaces of machine parts with the aid of a ring which is in contact on these two sealing surfaces, in particular on extrusion machines, where this sealing is of significance in strainer--and tool-changing devices. It is the task of the invention to create compact very simple constructed sealings built with simple means, which seals operate faultlessly even at very high pressures and yet can be relieved if a machine part is to be displaced against the other. The invention utilizes a substantially planar ring comprising an elastic but very strong material which projects on one side beyond its sealing surface, and this ring through pressure onto the portion of the ring projecting on one side beyond this sealing surface is deformed such that it becomes arched and therein comes to rest with its one marginal edge in contact on the one sealing surface in the form of an annular line and is supported in the form of an annular line on the other sealing surface. The sealing is achieved through two annular line-form sealing surface at which the seal pressing and thus the sealing effect is very high. The ring can be deformed to achieve the sealing or to cancel the sealing effect and annular line-form contact pressing.

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First Claim